1 /* -----------------------------------------------------------------------------
2 Software License for The Fraunhofer FDK AAC Codec Library for Android
3
4 © Copyright 1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten
5 Forschung e.V. All rights reserved.
6
7 1. INTRODUCTION
8 The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
9 that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
10 scheme for digital audio. This FDK AAC Codec software is intended to be used on
11 a wide variety of Android devices.
12
13 AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
14 general perceptual audio codecs. AAC-ELD is considered the best-performing
15 full-bandwidth communications codec by independent studies and is widely
16 deployed. AAC has been standardized by ISO and IEC as part of the MPEG
17 specifications.
18
19 Patent licenses for necessary patent claims for the FDK AAC Codec (including
20 those of Fraunhofer) may be obtained through Via Licensing
21 (www.vialicensing.com) or through the respective patent owners individually for
22 the purpose of encoding or decoding bit streams in products that are compliant
23 with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
24 Android devices already license these patent claims through Via Licensing or
25 directly from the patent owners, and therefore FDK AAC Codec software may
26 already be covered under those patent licenses when it is used for those
27 licensed purposes only.
28
29 Commercially-licensed AAC software libraries, including floating-point versions
30 with enhanced sound quality, are also available from Fraunhofer. Users are
31 encouraged to check the Fraunhofer website for additional applications
32 information and documentation.
33
34 2. COPYRIGHT LICENSE
35
36 Redistribution and use in source and binary forms, with or without modification,
37 are permitted without payment of copyright license fees provided that you
38 satisfy the following conditions:
39
40 You must retain the complete text of this software license in redistributions of
41 the FDK AAC Codec or your modifications thereto in source code form.
42
43 You must retain the complete text of this software license in the documentation
44 and/or other materials provided with redistributions of the FDK AAC Codec or
45 your modifications thereto in binary form. You must make available free of
46 charge copies of the complete source code of the FDK AAC Codec and your
47 modifications thereto to recipients of copies in binary form.
48
49 The name of Fraunhofer may not be used to endorse or promote products derived
50 from this library without prior written permission.
51
52 You may not charge copyright license fees for anyone to use, copy or distribute
53 the FDK AAC Codec software or your modifications thereto.
54
55 Your modified versions of the FDK AAC Codec must carry prominent notices stating
56 that you changed the software and the date of any change. For modified versions
57 of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
58 must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
59 AAC Codec Library for Android."
60
61 3. NO PATENT LICENSE
62
63 NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
64 limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
65 Fraunhofer provides no warranty of patent non-infringement with respect to this
66 software.
67
68 You may use this FDK AAC Codec software or modifications thereto only for
69 purposes that are authorized by appropriate patent licenses.
70
71 4. DISCLAIMER
72
73 This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
74 holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
75 including but not limited to the implied warranties of merchantability and
76 fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
77 CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
78 or consequential damages, including but not limited to procurement of substitute
79 goods or services; loss of use, data, or profits, or business interruption,
80 however caused and on any theory of liability, whether in contract, strict
81 liability, or tort (including negligence), arising in any way out of the use of
82 this software, even if advised of the possibility of such damage.
83
84 5. CONTACT INFORMATION
85
86 Fraunhofer Institute for Integrated Circuits IIS
87 Attention: Audio and Multimedia Departments - FDK AAC LL
88 Am Wolfsmantel 33
89 91058 Erlangen, Germany
90
91 www.iis.fraunhofer.de/amm
92 amm-info@iis.fraunhofer.de
93 ----------------------------------------------------------------------------- */
94
95 /**************************** AAC encoder library ******************************
96
97 Author(s): M.Werner
98
99 Description: Short block grouping
100
101 *******************************************************************************/
102
103 #include "psy_const.h"
104 #include "interface.h"
105
106 /*
107 * this routine does not work in-place
108 */
109
110 /*
111 * Don't use fAddSaturate2() because it looses one bit accuracy which is
112 * usefull for quality.
113 */
nrgAddSaturate(const FIXP_DBL a,const FIXP_DBL b)114 static inline FIXP_DBL nrgAddSaturate(const FIXP_DBL a, const FIXP_DBL b) {
115 return ((a >= (FIXP_DBL)MAXVAL_DBL - b) ? (FIXP_DBL)MAXVAL_DBL : (a + b));
116 }
117
FDKaacEnc_groupShortData(FIXP_DBL * mdctSpectrum,SFB_THRESHOLD * sfbThreshold,SFB_ENERGY * sfbEnergy,SFB_ENERGY * sfbEnergyMS,SFB_ENERGY * sfbSpreadEnergy,const INT sfbCnt,const INT sfbActive,const INT * sfbOffset,const FIXP_DBL * sfbMinSnrLdData,INT * groupedSfbOffset,INT * maxSfbPerGroup,FIXP_DBL * groupedSfbMinSnrLdData,const INT noOfGroups,const INT * groupLen,const INT granuleLength)118 void FDKaacEnc_groupShortData(FIXP_DBL *mdctSpectrum, /* in-out */
119 SFB_THRESHOLD *sfbThreshold, /* in-out */
120 SFB_ENERGY *sfbEnergy, /* in-out */
121 SFB_ENERGY *sfbEnergyMS, /* in-out */
122 SFB_ENERGY *sfbSpreadEnergy, const INT sfbCnt,
123 const INT sfbActive, const INT *sfbOffset,
124 const FIXP_DBL *sfbMinSnrLdData,
125 INT *groupedSfbOffset, /* out */
126 INT *maxSfbPerGroup, /* out */
127 FIXP_DBL *groupedSfbMinSnrLdData,
128 const INT noOfGroups, const INT *groupLen,
129 const INT granuleLength) {
130 INT i, j;
131 INT line; /* counts through lines */
132 INT sfb; /* counts through scalefactor bands */
133 INT grp; /* counts through groups */
134 INT wnd; /* counts through windows in a group */
135 INT offset; /* needed in sfbOffset grouping */
136 INT highestSfb;
137 INT granuleLength_short = granuleLength / TRANS_FAC;
138
139 C_ALLOC_SCRATCH_START(tmpSpectrum, FIXP_DBL, (1024))
140
141 /* for short blocks: regroup spectrum and */
142 /* group energies and thresholds according to grouping */
143
144 /* calculate maxSfbPerGroup */
145 highestSfb = 0;
146 for (wnd = 0; wnd < TRANS_FAC; wnd++) {
147 for (sfb = sfbActive - 1; sfb >= highestSfb; sfb--) {
148 for (line = sfbOffset[sfb + 1] - 1; line >= sfbOffset[sfb]; line--) {
149 if (mdctSpectrum[wnd * granuleLength_short + line] !=
150 FL2FXCONST_SPC(0.0))
151 break; /* this band is not completely zero */
152 }
153 if (line >= sfbOffset[sfb]) break; /* this band was not completely zero */
154 }
155 highestSfb = fixMax(highestSfb, sfb);
156 }
157 highestSfb = highestSfb > 0 ? highestSfb : 0;
158 *maxSfbPerGroup = highestSfb + 1;
159
160 /* calculate groupedSfbOffset */
161 i = 0;
162 offset = 0;
163 for (grp = 0; grp < noOfGroups; grp++) {
164 for (sfb = 0; sfb < sfbActive + 1; sfb++) {
165 groupedSfbOffset[i++] = offset + sfbOffset[sfb] * groupLen[grp];
166 }
167 i += sfbCnt - sfb;
168 offset += groupLen[grp] * granuleLength_short;
169 }
170 groupedSfbOffset[i++] = granuleLength;
171
172 /* calculate groupedSfbMinSnr */
173 i = 0;
174 for (grp = 0; grp < noOfGroups; grp++) {
175 for (sfb = 0; sfb < sfbActive; sfb++) {
176 groupedSfbMinSnrLdData[i++] = sfbMinSnrLdData[sfb];
177 }
178 i += sfbCnt - sfb;
179 }
180
181 /* sum up sfbThresholds */
182 wnd = 0;
183 i = 0;
184 for (grp = 0; grp < noOfGroups; grp++) {
185 for (sfb = 0; sfb < sfbActive; sfb++) {
186 FIXP_DBL thresh = sfbThreshold->Short[wnd][sfb];
187 for (j = 1; j < groupLen[grp]; j++) {
188 thresh = nrgAddSaturate(thresh, sfbThreshold->Short[wnd + j][sfb]);
189 }
190 sfbThreshold->Long[i++] = thresh;
191 }
192 i += sfbCnt - sfb;
193 wnd += groupLen[grp];
194 }
195
196 /* sum up sfbEnergies left/right */
197 wnd = 0;
198 i = 0;
199 for (grp = 0; grp < noOfGroups; grp++) {
200 for (sfb = 0; sfb < sfbActive; sfb++) {
201 FIXP_DBL energy = sfbEnergy->Short[wnd][sfb];
202 for (j = 1; j < groupLen[grp]; j++) {
203 energy = nrgAddSaturate(energy, sfbEnergy->Short[wnd + j][sfb]);
204 }
205 sfbEnergy->Long[i++] = energy;
206 }
207 i += sfbCnt - sfb;
208 wnd += groupLen[grp];
209 }
210
211 /* sum up sfbEnergies mid/side */
212 wnd = 0;
213 i = 0;
214 for (grp = 0; grp < noOfGroups; grp++) {
215 for (sfb = 0; sfb < sfbActive; sfb++) {
216 FIXP_DBL energy = sfbEnergyMS->Short[wnd][sfb];
217 for (j = 1; j < groupLen[grp]; j++) {
218 energy = nrgAddSaturate(energy, sfbEnergyMS->Short[wnd + j][sfb]);
219 }
220 sfbEnergyMS->Long[i++] = energy;
221 }
222 i += sfbCnt - sfb;
223 wnd += groupLen[grp];
224 }
225
226 /* sum up sfbSpreadEnergies */
227 wnd = 0;
228 i = 0;
229 for (grp = 0; grp < noOfGroups; grp++) {
230 for (sfb = 0; sfb < sfbActive; sfb++) {
231 FIXP_DBL energy = sfbSpreadEnergy->Short[wnd][sfb];
232 for (j = 1; j < groupLen[grp]; j++) {
233 energy = nrgAddSaturate(energy, sfbSpreadEnergy->Short[wnd + j][sfb]);
234 }
235 sfbSpreadEnergy->Long[i++] = energy;
236 }
237 i += sfbCnt - sfb;
238 wnd += groupLen[grp];
239 }
240
241 /* re-group spectrum */
242 wnd = 0;
243 i = 0;
244 for (grp = 0; grp < noOfGroups; grp++) {
245 for (sfb = 0; sfb < sfbActive; sfb++) {
246 int width = sfbOffset[sfb + 1] - sfbOffset[sfb];
247 FIXP_DBL *pMdctSpectrum =
248 &mdctSpectrum[sfbOffset[sfb]] + wnd * granuleLength_short;
249 for (j = 0; j < groupLen[grp]; j++) {
250 FIXP_DBL *pTmp = pMdctSpectrum;
251 for (line = width; line > 0; line--) {
252 tmpSpectrum[i++] = *pTmp++;
253 }
254 pMdctSpectrum += granuleLength_short;
255 }
256 }
257 i += (groupLen[grp] * (sfbOffset[sfbCnt] - sfbOffset[sfb]));
258 wnd += groupLen[grp];
259 }
260
261 FDKmemcpy(mdctSpectrum, tmpSpectrum, granuleLength * sizeof(FIXP_DBL));
262
263 C_ALLOC_SCRATCH_END(tmpSpectrum, FIXP_DBL, (1024))
264 }
265